[U-Boot] tools: env: fix config file loading in env library

[Tom Rini]

On Fri, Apr 29, 2016 at 10:00:11PM +0200, Anatolij Gustschin wrote:

> env library is broken as the config file pointer is only initialized
> in main(). When running in the env library parse_config() fails:
> 
>   Cannot parse config file '(null)': Bad address
> 
> Ensure that config file pointer is always initialized.
> 
> Signed-off-by: Anatolij Gustschin <agust at denx.de>
> Cc: Stefano Babic <sbabic at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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